Hypernym

epoch 3

noun

a unit of geological time that is a subdivision of a period and is itself divided into ages

Part_meronym

Jurassic 1

noun

from 190 million to 135 million years ago; dinosaurs; conifers

Callovian 1

noun

In the geologic timescale, an age or stage in the Middle Jurassic, lasting between 164.7 ± 4.0 Ma (million years ago) and 161.2 ± 4.0 Ma.

Aalenian 1

noun

a subdivision of the Middle Jurassic epoch that extends from about 175.6 to about 171.6 million years ago.

Bajocian 1

noun

In the geologic timescale, the Bajocian is an age or stage in the Middle Jurassic.

Bathonian 1

noun

In the geologic timescale the Bathonian is an age or stage of the Middle Jurassic; it lasted from approximately 168.3 to around 166.1 million years ago.

Middle Jurassic 2

noundomain: time

EnWordnet [ver.5.0]

English

Definition

The Middle Jurassic is the second epoch of the Jurassic Period; it lasted from 176 to 161 million years ago.

Examples

1.During the Middle Jurassic epoch, Pangaea began to separate into Laurasia and Gondwana, and the Atlantic Ocean formed.

Part_holonym

Jurassic 1

noun

from 190 million to 135 million years ago; dinosaurs; conifers

Callovian 1

noun

In the geologic timescale, an age or stage in the Middle Jurassic, lasting between 164.7 ± 4.0 Ma (million years ago) and 161.2 ± 4.0 Ma.

Aalenian 1

noun

a subdivision of the Middle Jurassic epoch that extends from about 175.6 to about 171.6 million years ago.

Bajocian 1

noun

In the geologic timescale, the Bajocian is an age or stage in the Middle Jurassic.

Bathonian 1

noun

In the geologic timescale the Bathonian is an age or stage of the Middle Jurassic; it lasted from approximately 168.3 to around 166.1 million years ago.